TechCrunch's Michael Arrington writes that a "very small number of people" are testing out phone number porting to Google's semi-new phone management system, Google Voice (which we toured in its closed beta). Furthermore, a "source inside Google" states that number portability will be offered to everyone later this year. If correct—and, be warned, rumors from inside Mountain View can dissipate entirely—it would solve one of Google Voice's biggest barriers to entry, especially if accompanied with mobile apps that manage outgoing calls. Would you give over your long-standing phone number to the big G's servers?